paste this code inside .htaccess
php_value upload_max_filesize 64M
php_value post_max_size 128M
php_value memory_limit 256M
php_value max_execution_time 300
php_value max_input_time 300
still not success?
Ok maybe in your theme function.php add this at the bottom
@ini_set( 'upload_max_size' , '64M' );
@ini_set( 'post_max_size', '64M');
@ini_set( 'max_execution_time', '300' );
Ok c'mon.. still not success? maybe you can create php.ini save it at root of the folder same in your index.php
paste this inside php.ini
upload_max_filesize = 25M
post_max_size = 13M
memory_limit = 15M